Add pipelines.delete_runs endpoint

apiserver/schema/services/pipelines.conf

@@ -1,7 +1,42 @@
 _description: "Provides a management API for pipelines in the system."
 _definitions {
+    include "_common.conf"
+}
+delete_runs {
+    "999.0": ${_definitions.batch_operation} {
+        description: Delete pipeline runs
+        request {
+            required: [ids, project]
+            properties {
+                ids.description: "IDs of the pipeline runs to delete. Should be the ids of pipeline controller tasks"
+                project {
+                    description: "Pipeline project ids. When deleting at least one run should be left"
+                    type: string
+                }
+            }
+        }
+        response {
+            properties {
+                succeeded.items.properties.deleted {
+                    description: "Indicates whether the task was deleted"
+                    type: boolean
+                }
+                succeeded.items.properties.updated_children {
+                    description: "Number of child tasks whose parent property was updated"
+                    type: integer
+                }
+                succeeded.items.properties.updated_models {
+                    description: "Number of models whose task property was updated"
+                    type: integer
+                }
+                succeeded.items.properties.deleted_models {
+                    description: "Number of deleted output models"
+                    type: integer
+                }
+            }
+        }
+    }
 }
-
 start_pipeline {
     "2.17" {
         description: "Start a pipeline"